Development And Improvement Of Power Amplifier Of WCDMA Base Station

With the rapid development of wireless technology, large capacity, broad band and high spectrum efficiency become the important characteristics of modern communication. For example, broadband modulation and multi-carrier technique have being applied in WCDMA system. These techniques call for high performance equipments. As one of the key part of base station, the power amplifier plays an important role. Therefore, to improve the power amplifier to satisfy the requirement of gain, power, efficiency and linearity becomes one of the hotspot in research.The major task of the paper is to design the second-stage power amplifier of WCDMA base station, and to perform the improvement research. Work of five aspects is chiefly carried out as follows:1. Analyze the characteristics of non-linear distortion of power amplifier, as well as design theory and method of PA.2. Design the power amplifier using EDA, develop the PA circuit and shielding box with heat sink, and test the power amplifier.3. Analyze the parasitic effect of PA, perform optimization with the combination of EM and circuit simulation.4. Provide an alternate method to solve the problem of resonance, and verify with both EM simulation and test.5. Perform the improvement analysis of PA in the sight of harmonic-sets load/source pull and multi-harmonic impedance matching technique.